#include<bits/stdc++.h>

using namespace std;
//计算n! 注意范围 n<14才可以用int否则要用long long
int main() {
    int n = 10;
    int s = 1;
    for (int i = 2; i <= n; i++) {
        s *= i;
    }
    cout << s;


    return 0;
}
